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  <div id="dartdoc-main-content" class="col-xs-12 col-sm-9 col-md-8 main-content">
      <div><h1>Process class </h1></div>

    <section class="desc markdown">
      <p>The means to execute a program.</p>
<p>Use the static <a href="dart-io/Process/start.html">start</a> and <a href="dart-io/Process/run.html">run</a> methods to start a new process.
The run method executes the process non-interactively to completion.
In contrast, the start method allows your code to interact with the
running process.</p>
<h2 id="start-a-process-with-the-run-method">Start a process with the run method</h2>
<p>The following code sample uses the run method to create a process
that runs the UNIX command <code>ls</code>, which lists the contents of a directory.
The run method completes with a <a href="dart-io/ProcessResult-class.html">ProcessResult</a> object when the process
terminates. This provides access to the output and exit code from the
process. The run method does not return a Process object; this prevents your
code from interacting with the running process.</p>
<pre class="language-dart"><code>import 'dart:io';

main() {
  // List all files in the current directory in UNIX-like systems.
  Process.run('ls', ['-l']).then((ProcessResult results) {
    print(results.stdout);
  });
}
</code></pre>
<h2 id="start-a-process-with-the-start-method">Start a process with the start method</h2>
<p>The following example uses start to create the process.
The start method returns a <a href="dart-async/Future-class.html">Future</a> for a Process object.
When the future completes the process is started and
your code can interact with the
Process: writing to stdin, listening to stdout, and so on.</p>
<p>The following sample starts the UNIX <code>cat</code> utility, which when given no
command-line arguments, echos its input.
The program writes to the process's standard input stream
and prints data from its standard output stream.</p>
<pre class="language-dart"><code>import 'dart:io';
import 'dart:convert';

main() {
  Process.start('cat', []).then((Process process) {
    process.stdout
        .transform(utf8.decoder)
        .listen((data) { print(data); });
    process.stdin.writeln('Hello, world!');
    process.stdin.writeln('Hello, galaxy!');
    process.stdin.writeln('Hello, universe!');
  });
}
</code></pre>
<h2 id="standard-io-streams">Standard I/O streams</h2>
<p>As seen in the previous code sample, you can interact with the Process's
standard output stream through the getter <a href="dart-io/Process/stdout.html">stdout</a>,
and you can interact with the Process's standard input stream through
the getter <a href="dart-io/Process/stdin.html">stdin</a>.
In addition, Process provides a getter <a href="dart-io/Process/stderr.html">stderr</a> for using the Process's
standard error stream.</p>
<p>A Process's streams are distinct from the top-level streams
for the current program.</p>
<h2 id="exit-codes">Exit codes</h2>
<p>Call the <a href="dart-io/Process/exitCode.html">exitCode</a> method to get the exit code of the process.
The exit code indicates whether the program terminated successfully
(usually indicated with an exit code of 0) or with an error.</p>
<p>If the start method is used, the exitCode is available through a future
on the Process object (as shown in the example below).
If the run method is used, the exitCode is available
through a getter on the ProcessResult instance.</p>
<pre class="language-dart"><code>import 'dart:io';

main() {
  Process.start('ls', ['-l']).then((process) {
    // Get the exit code from the new process.
    process.exitCode.then((exitCode) {
      print('exit code: $exitCode');
    });
  });
}
</code></pre>
<h2 id="other-resources">Other resources</h2>
<p><a href="https://www.dartlang.org/dart-by-example/#dart-io-and-command-line-apps">Dart by Example</a>
provides additional task-oriented code samples that show how to use
various API from the <a href="dart-io/dart-io-library.html">dart:io</a> library.</p>
    </section>
    

    <section class="summary offset-anchor" id="constructors">
      <h2>Constructors</h2>

      <dl class="constructor-summary-list">
        <dt id="Process" class="callable">
          <span class="name"><a href="dart-io/Process/Process.html">Process</a></span><span class="signature">()</span>
        </dt>
        <dd>
          
        </dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="instance-properties">
      <h2>Properties</h2>

      <dl class="properties">
        <dt id="exitCode" class="property">
          <span class="name"><a href="dart-io/Process/exitCode.html">exitCode</a></span>
          <span class="signature">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/int-class.html">int</a></span>&gt;</span></span>         
        </dt>
        <dd>
          Returns a <code>Future</code> which completes with the exit code of the process
when the process completes. <a href="dart-io/Process/exitCode.html">[...]</a>
                  <div class="features">read-only</div>
</dd>
        <dt id="pid" class="property">
          <span class="name"><a href="dart-io/Process/pid.html">pid</a></span>
          <span class="signature">&#8594; <a href="dart-core/int-class.html">int</a></span>         
        </dt>
        <dd>
          Returns the process id of the process.
                  <div class="features">read-only</div>
</dd>
        <dt id="stderr" class="property">
          <span class="name"><a href="dart-io/Process/stderr.html">stderr</a></span>
          <span class="signature">&#8594; <a href="dart-async/Stream-class.html">Stream</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/int-class.html">int</a></span>&gt;</span></span>&gt;</span></span>         
        </dt>
        <dd>
          Returns the standard error stream of the process as a <code>Stream</code>.
                  <div class="features">read-only</div>
</dd>
        <dt id="stdin" class="property">
          <span class="name"><a href="dart-io/Process/stdin.html">stdin</a></span>
          <span class="signature">&#8594; <a href="dart-io/IOSink-class.html">IOSink</a></span>         
        </dt>
        <dd>
          Returns the standard input stream of the process as an <a href="dart-io/IOSink-class.html">IOSink</a>.
                  <div class="features">read-only</div>
</dd>
        <dt id="stdout" class="property">
          <span class="name"><a href="dart-io/Process/stdout.html">stdout</a></span>
          <span class="signature">&#8594; <a href="dart-async/Stream-class.html">Stream</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/int-class.html">int</a></span>&gt;</span></span>&gt;</span></span>         
        </dt>
        <dd>
          Returns the standard output stream of the process as a <code>Stream</code>.
                  <div class="features">read-only</div>
</dd>
        <dt id="hashCode" class="property inherited">
          <span class="name"><a href="dart-core/Object/hashCode.html">hashCode</a></span>
          <span class="signature">&#8594; <a href="dart-core/int-class.html">int</a></span>         
        </dt>
        <dd class="inherited">
          The hash code for this object. <a href="dart-core/Object/hashCode.html">[...]</a>
                  <div class="features">read-only, inherited</div>
</dd>
        <dt id="runtimeType" class="property inherited">
          <span class="name"><a href="dart-core/Object/runtimeType.html">runtimeType</a></span>
          <span class="signature">&#8594; <a href="dart-core/Type-class.html">Type</a></span>         
        </dt>
        <dd class="inherited">
          A representation of the runtime type of the object.
                  <div class="features">read-only, inherited</div>
</dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="instance-methods">
      <h2>Methods</h2>
      <dl class="callables">
        <dt id="kill" class="callable">
          <span class="name"><a href="dart-io/Process/kill.html">kill</a></span><span class="signature">(<wbr>[<span class="parameter" id="kill-param-signal"><span class="type-annotation"><a href="dart-io/ProcessSignal-class.html">ProcessSignal</a></span> <span class="parameter-name">signal</span> = <span class="default-value">ProcessSignal.sigterm</span></span> ])
            <span class="returntype parameter">&#8594; <a href="dart-core/bool-class.html">bool</a></span>
          </span>
                  </dt>
        <dd>
          Kills the process. <a href="dart-io/Process/kill.html">[...]</a>
                  
</dd>
        <dt id="noSuchMethod" class="callable inherited">
          <span class="name"><a href="dart-core/Object/noSuchMethod.html">noSuchMethod</a></span><span class="signature">(<wbr><span class="parameter" id="noSuchMethod-param-invocation"><span class="type-annotation"><a href="dart-core/Invocation-class.html">Invocation</a></span> <span class="parameter-name">invocation</span></span>)
            <span class="returntype parameter">&#8594; dynamic</span>
          </span>
                  </dt>
        <dd class="inherited">
          Invoked when a non-existent method or property is accessed. <a href="dart-core/Object/noSuchMethod.html">[...]</a>
                  <div class="features">inherited</div>
</dd>
        <dt id="toString" class="callable inherited">
          <span class="name"><a href="dart-core/Object/toString.html">toString</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; <a href="dart-core/String-class.html">String</a></span>
          </span>
                  </dt>
        <dd class="inherited">
          Returns a string representation of this object.
                  <div class="features">inherited</div>
</dd>
      </dl>
    </section>

    <section class="summary offset-anchor inherited" id="operators">
      <h2>Operators</h2>
      <dl class="callables">
        <dt id="operator ==" class="callable inherited">
          <span class="name"><a href="dart-core/Object/operator_equals.html">operator ==</a></span><span class="signature">(<wbr><span class="parameter" id="==-param-other"><span class="type-annotation">dynamic</span> <span class="parameter-name">other</span></span>)
            <span class="returntype parameter">&#8594; <a href="dart-core/bool-class.html">bool</a></span>
          </span>
                  </dt>
        <dd class="inherited">
          The equality operator. <a href="dart-core/Object/operator_equals.html">[...]</a>
                  <div class="features">inherited</div>
</dd>
      </dl>
    </section>


    <section class="summary offset-anchor" id="static-methods">
      <h2>Static Methods</h2>
      <dl class="callables">
        <dt id="killPid" class="callable">
          <span class="name"><a href="dart-io/Process/killPid.html">killPid</a></span><span class="signature">(<wbr><span class="parameter" id="killPid-param-pid"><span class="type-annotation"><a href="dart-core/int-class.html">int</a></span> <span class="parameter-name">pid</span>, [</span> <span class="parameter" id="killPid-param-signal"><span class="type-annotation"><a href="dart-io/ProcessSignal-class.html">ProcessSignal</a></span> <span class="parameter-name">signal</span> = <span class="default-value">ProcessSignal.sigterm</span></span> ])
            <span class="returntype parameter">&#8594; <a href="dart-core/bool-class.html">bool</a></span>
          </span>
                  </dt>
        <dd>
          Kills the process with id <code>pid</code>. <a href="dart-io/Process/killPid.html">[...]</a>
                  
</dd>
        <dt id="run" class="callable">
          <span class="name"><a href="dart-io/Process/run.html">run</a></span><span class="signature">(<wbr><span class="parameter" id="run-param-executable"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">executable</span>, </span> <span class="parameter" id="run-param-arguments"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">arguments</span>, {</span> <span class="parameter" id="run-param-workingDirectory"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">workingDirectory</span>, </span> <span class="parameter" id="run-param-environment"><span class="type-annotation"><a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>, <span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">environment</span>, </span> <span class="parameter" id="run-param-includeParentEnvironment"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">includeParentEnvironment</span>: <span class="default-value">true</span>, </span> <span class="parameter" id="run-param-runInShell"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">runInShell</span>: <span class="default-value">false</span>, </span> <span class="parameter" id="run-param-stdoutEncoding"><span class="type-annotation"><a href="dart-convert/Encoding-class.html">Encoding</a></span> <span class="parameter-name">stdoutEncoding</span>: <span class="default-value">systemEncoding</span>, </span> <span class="parameter" id="run-param-stderrEncoding"><span class="type-annotation"><a href="dart-convert/Encoding-class.html">Encoding</a></span> <span class="parameter-name">stderrEncoding</span>: <span class="default-value">systemEncoding</span></span> })
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-io/ProcessResult-class.html">ProcessResult</a></span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Starts a process and runs it non-interactively to completion. The
process run is <code>executable</code> with the specified <code>arguments</code>. <a href="dart-io/Process/run.html">[...]</a>
                  
</dd>
        <dt id="runSync" class="callable">
          <span class="name"><a href="dart-io/Process/runSync.html">runSync</a></span><span class="signature">(<wbr><span class="parameter" id="runSync-param-executable"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">executable</span>, </span> <span class="parameter" id="runSync-param-arguments"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">arguments</span>, {</span> <span class="parameter" id="runSync-param-workingDirectory"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">workingDirectory</span>, </span> <span class="parameter" id="runSync-param-environment"><span class="type-annotation"><a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>, <span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">environment</span>, </span> <span class="parameter" id="runSync-param-includeParentEnvironment"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">includeParentEnvironment</span>: <span class="default-value">true</span>, </span> <span class="parameter" id="runSync-param-runInShell"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">runInShell</span>: <span class="default-value">false</span>, </span> <span class="parameter" id="runSync-param-stdoutEncoding"><span class="type-annotation"><a href="dart-convert/Encoding-class.html">Encoding</a></span> <span class="parameter-name">stdoutEncoding</span>: <span class="default-value">systemEncoding</span>, </span> <span class="parameter" id="runSync-param-stderrEncoding"><span class="type-annotation"><a href="dart-convert/Encoding-class.html">Encoding</a></span> <span class="parameter-name">stderrEncoding</span>: <span class="default-value">systemEncoding</span></span> })
            <span class="returntype parameter">&#8594; <a href="dart-io/ProcessResult-class.html">ProcessResult</a></span>
          </span>
                  </dt>
        <dd>
          Starts a process and runs it to completion. This is a synchronous
call and will block until the child process terminates. <a href="dart-io/Process/runSync.html">[...]</a>
                  
</dd>
        <dt id="start" class="callable">
          <span class="name"><a href="dart-io/Process/start.html">start</a></span><span class="signature">(<wbr><span class="parameter" id="start-param-executable"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">executable</span>, </span> <span class="parameter" id="start-param-arguments"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">arguments</span>, {</span> <span class="parameter" id="start-param-workingDirectory"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">workingDirectory</span>, </span> <span class="parameter" id="start-param-environment"><span class="type-annotation"><a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>, <span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">environment</span>, </span> <span class="parameter" id="start-param-includeParentEnvironment"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">includeParentEnvironment</span>: <span class="default-value">true</span>, </span> <span class="parameter" id="start-param-runInShell"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">runInShell</span>: <span class="default-value">false</span>, </span> <span class="parameter" id="start-param-mode"><span class="type-annotation"><a href="dart-io/ProcessStartMode-class.html">ProcessStartMode</a></span> <span class="parameter-name">mode</span>: <span class="default-value">ProcessStartMode.normal</span></span> })
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-io/Process-class.html">Process</a></span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Starts a process running the <code>executable</code> with the specified
<code>arguments</code>. Returns a <code>Future&lt;Process&gt;</code> that completes with a
Process instance when the process has been successfully
started. That <a href="dart-io/Process-class.html">Process</a> object can be used to interact with the
process. If the process cannot be started the returned <a href="dart-async/Future-class.html">Future</a>
completes with an exception. <a href="dart-io/Process/start.html">[...]</a>
                  
</dd>
      </dl>
    </section>


  </div> <!-- /.main-content -->

  <div id="dartdoc-sidebar-right" class="col-xs-6 col-sm-6 col-md-2 sidebar sidebar-offcanvas-right">
    <ol>
      <li class="section-title"><a href="dart-io/Process-class.html#constructors">Constructors</a></li>
      <li><a href="dart-io/Process/Process.html">Process</a></li>
    
      <li class="section-title">
        <a href="dart-io/Process-class.html#instance-properties">Properties</a>
      </li>
      <li><a href="dart-io/Process/exitCode.html">exitCode</a></li>
      <li><a href="dart-io/Process/pid.html">pid</a></li>
      <li><a href="dart-io/Process/stderr.html">stderr</a></li>
      <li><a href="dart-io/Process/stdin.html">stdin</a></li>
      <li><a href="dart-io/Process/stdout.html">stdout</a></li>
      <li class="inherited"><a href="dart-core/Object/hashCode.html">hashCode</a></li>
      <li class="inherited"><a href="dart-core/Object/runtimeType.html">runtimeType</a></li>
    
      <li class="section-title"><a href="dart-io/Process-class.html#instance-methods">Methods</a></li>
      <li><a href="dart-io/Process/kill.html">kill</a></li>
      <li class="inherited"><a href="dart-core/Object/noSuchMethod.html">noSuchMethod</a></li>
      <li class="inherited"><a href="dart-core/Object/toString.html">toString</a></li>
    
      <li class="section-title inherited"><a href="dart-io/Process-class.html#operators">Operators</a></li>
      <li class="inherited"><a href="dart-core/Object/operator_equals.html">operator ==</a></li>
    
    
      <li class="section-title"><a href="dart-io/Process-class.html#static-methods">Static methods</a></li>
      <li><a href="dart-io/Process/killPid.html">killPid</a></li>
      <li><a href="dart-io/Process/run.html">run</a></li>
      <li><a href="dart-io/Process/runSync.html">runSync</a></li>
      <li><a href="dart-io/Process/start.html">start</a></li>
    
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